mirror of
https://github.com/rspeer/wordfreq.git
synced 2024-12-24 01:41:39 +00:00
92 lines
2.7 KiB
Python
92 lines
2.7 KiB
Python
import argparse
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import unicodedata
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from ftfy import chardata
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import pathlib
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from pkg_resources import resource_filename
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DATA_PATH = pathlib.Path(resource_filename('wordfreq', 'data'))
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def _emoji_char_class():
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"""
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Build a regex for emoji substitution. First we create a regex character set
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(like "[a-cv-z]") matching characters we consider emoji. The final regex
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matches one such character followed by any number of spaces and identical
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characters.
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"""
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emoji_file = DATA_PATH / 'emoji.txt'
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ranges = []
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for i, c in enumerate(chardata.CHAR_CLASS_STRING):
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# c represents the character class (3 corresponds to emoji)
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if c == '3' and i >= 0x2600 and i != 0xfffd:
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if ranges and i == ranges[-1][1] + 1:
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ranges[-1][1] = i
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else:
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ranges.append([i, i])
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out = '[%s]' % ''.join(chr(a) + '-' + chr(b) for a, b in ranges)
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with emoji_file.open(mode='w') as file:
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file.write(out)
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def _non_punct_class():
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"""
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Builds a regex that matches anything that is not a one of the following
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classes:
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- P: punctuation
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- S: symbols
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- Z: separators
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- C: control characters
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This will classify symbols, including emoji, as punctuation; callers that
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want to treat emoji separately should filter them out first.
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"""
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non_punct_file = DATA_PATH / 'non_punct.txt'
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out = func_to_regex(lambda c: unicodedata.category(c)[0] not in 'PSZC')
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with non_punct_file.open(mode='w') as file:
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file.write(out)
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def _combining_mark_class():
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"""
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Builds a regex that matches anything that is a combining mark
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"""
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combining_mark_file = DATA_PATH / 'combining_mark.txt'
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out = func_to_regex(lambda c: unicodedata.category(c)[0] == 'M')
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with combining_mark_file.open(mode='w') as file:
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file.write(out)
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def func_to_regex(accept):
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"""
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Converts a function that accepts a single unicode character into a regex.
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Unassigned unicode characters are treated like their neighbors.
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"""
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ranges = []
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start = None
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has_accepted = False
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for x in range(0x110000):
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c = chr(x)
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if accept(c):
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has_accepted = True
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if start is None:
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start = c
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elif unicodedata.category(c) == 'Cn':
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if start is None:
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start = c
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elif start is not None:
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if has_accepted:
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ranges.append('-'.join([start, chr(x-1)]))
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has_accepted = False
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start = None
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else:
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if has_accepted and start is not None:
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ranges.append('-'.join([start, chr(x-1)]))
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return '[%s]' % ''.join(ranges)
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if __name__ == '__main__':
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_combining_mark_class()
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_non_punct_class()
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_emoji_char_class()
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